Most likely, in the case of DXM, you won't get the typical reaction.
In case of PMA/PMMA, we don't know. PMA/PMMA are said to produce no reaction, if they are mixed in a pill, you won't notice.
With other substances, it depends on what it is mixed with but the general rule of thumb always applies; not straight to darkpurple, not an Ecstasy like substance.
The EZ Supreme proves useful for DXM as well. DXM does not react with EZ Supreme, it bubbles a bit when you add Supreme Phase 1.
(Remark: I have a pure DXM sample,about one year old, supplied by a laboratory especially for purposes like this)
Since MDMA/MDEA do not react with Supreme Phase 1, you can now tell whether your pill probably contains DXM (it starts bubbling a bit) and probably MDMA/MDEA. If this is the case, there will also be blue as soon as you add Supreme Phase 2 (indicating MDMA/MDEA).
aj